Lietiug-jack



UNITED sTATEs PATENT oEEicE.

ROBERT YV. GENUNG, OF BLOOMING GROVE, NEW YORK. I

LIETING-JACK.

'Speccaton of Letters Patent No. 11,298, dated July 11, 1854.

To all whom t may concern: p

Be it known that I, ROBERT W. GENUNG, of Blooming Grove, in the county of Orange and State of New York, have invented a new and useful Improvement in Lifting Jacks; and I do hereby declare that the following is a full, clear, and exact de scription of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1, is a side elevation of a lifting jack with my improvements. 'F ig. 2, is a front elevation of the same. Fig. 3, is a back view.

Similar letters of reference in each of the several gures indicate corresponding parte.

The nature of my invention consists, 1st, in a peculiar and simple manner of making the fulcrum of the lifting lever capable of being adjusted so as to allow the rack bar to descend freely after it has been raised to the desired height. By this arrangement, the lever will also be always kept in its place ready for use, and will, (when adjusted so as to allow the rack bar to descend), be effectually prevented, without the necessity of holding it by the hand, from coming in contact with said bar until moved by the hand of the operator into its proper position for lifting the same.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

A, represents the guide frame in which the lifting rack bar is secured, and slides up and down freely, in the ordinary manner, or as represented in the drawing.

B, is the swinging pawl for stopping the rack bar from "falling while it is being raised. This pawl is made and arranged slightly different from the present mode, as will be evident from the drawing, it having two ears, a, a, cast in its upper end, and-being secured by said ears to the upper eX- tremity of the frame, A, by the fulcrum pin, b. By thus constructing the pawl and arranging it, it will be seen that the rack bar is capable of passing up between the ears of the same, and serves as a stop to prevent it being thrown back out of operative position. i

C, is the lifting lever, it is constructed as shown in the drawing, and has its fulcrum resting loosely in the bearings, d, 0l. In each of these bearings, a semi-circular slot, e, is cast, for the fulcrum to play in freely as the lever is thrown in and out of contact with the rack bar. This slot is divided at its center by the partition f, so as to form two smaller semi-circular rests, g, g', for the fulcrum of the lever to rest in alternately. By thus forming the slot, e, and dividing it, it will be evident from the drawing, that the lever can be adjusted with ease, so as to be in or out of contact with the rack bar, and when thrown out of contact, its fulcrum will rest in the slot, g, as shown in red, and be held there by the partition, f, and prevented from getting in contact with the bar, while falling. The partition, f, also keeps the lever in Contact with the bar while lifting, and prevents its fulcrum slipping or changing its position, and' allowing the bar to fall at the time when the` pawl has no hold upon it.l

All necessity of holding the lever in the hand while it is adjusted for letting the bar fall, is avoided, as the partition, ff, prevents its fulcrum from shifting, and allowing the lever to get in contact with the bar. It is the semi-circular slot, and the two smaller semi-circular fulcrum rests forming part of said slot that constitute the gist of my invention.

lVhat I claim as my invention, and desire to secure by Letters Patent, is Making the lever capable of being adjusted so as to be thrown in and out of con- ROBERT W. GENUNG. Witnesses O. D. MUNN, J. W. HAMILTON. 

